diff --git a/.github/workflows/markdownlint.yml b/.github/workflows/markdownlint.yml
index e200fb3..1616aa1 100644
--- a/.github/workflows/markdownlint.yml
+++ b/.github/workflows/markdownlint.yml
@@ -15,7 +15,7 @@ jobs:
       - name: checkout
         uses: actions/checkout@v7
       - name: Set up Ruby
-        uses: ruby/setup-ruby@v1.319.0
+        uses: ruby/setup-ruby@v1.321.0
         # see https://github.com/ruby/setup-ruby
         with:
           ruby-version: '3.3'